Revert "Remove 'Element.docRange'."

pkg/analyzer/lib/dart/element/element.dart

Index: pkg/analyzer/lib/dart/element/element.dart
diff --git a/pkg/analyzer/lib/dart/element/element.dart b/pkg/analyzer/lib/dart/element/element.dart
index b5b80b7857666e9b7b531532d520b29749bca147..b829beed070b230382d275e103e98208b085ea62 100644
--- a/pkg/analyzer/lib/dart/element/element.dart
+++ b/pkg/analyzer/lib/dart/element/element.dart
@@ -590,6 +590,15 @@ abstract class Element implements AnalysisTarget {
   String get displayName;
 
   /**
+   * Return the source range of the documentation comment for this element,
+   * or `null` if this element does not or cannot have a documentation.
+   *
+   * Deprecated.  Use [documentationComment] instead.
+   */
+  @deprecated
+  SourceRange get docRange;
+
+  /**
    * Return the content of the documentation comment (including delimiters) for
    * this element, or `null` if this element does not or cannot have
    * documentation.